Ejector Design Calculation Xls | Fixed Verified

How to Build a Fixed, Reliable Ejector Design Calculator in Excel (XLS)

The Problem: Many downloaded ejector design spreadsheets are unprotected, have broken macros, or use circular references that crash Excel. The Solution: Build your own fixed calculator using the standard Constant Area Mixing (CAM) model.

Below is the step-by-step logic for a Steam-Jet Ejector (single stage), which forms the basis for gas/vapor ejectors.

2. Nozzle Sizing (Isentropic Flow)

Using the motive pressure (P_m) and temperature (T_m), the fixed spreadsheet calculates the throat diameter (D_t).

• Formula used: D_t = sqrt((4 * m_motive) / (π * P_m * sqrt((γ * M) / (R * T_m)) * C_d))
• Fixed feature: The discharge coefficient (C_d) is locked to 0.95 for steam and 0.85 for gases, based on ESDU correlations.

2. Key Calculated Parameters (The Formulas)

In a fixed spreadsheet, avoid =ITERATION or circular references. Use these direct formulas. ejector design calculation xls fixed

Step 1: Fluid Property Database

The calculation is only as good as the fluid data.

• Gas Ejectors: You need specific heat ratios ($\gamma$ or $k$), Gas Constants ($R$), and compressibility factors ($Z$).
• Steam Ejectors: You need Steam Tables. An embedded VBA function or lookup table for enthalpy ($h$) and entropy ($s$) based on Pressure and Temperature is required.

The "Entrainment Ratio" Divergence

The entrainment ratio (ω = secondary flow / motive flow) is the heart of the design. In unstable spreadsheets, a 5% change in backpressure results in a 500% calculation error. Fixed XLS tools use validated curves from ASME PTC 37 or ESDU 86030, locked to prevent accidental scaling.

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